Brake-shoe



(No Modrel.)

G.'M. SARGENT.

BRAKE SHOE. N. 374,273. Patented Dec. 6, 1887.

UNITED STATES PATENT OFFICE.

GEORGE M. SARGENT, OF CHICAGO, ILLINOIS.

BRAKE-SHOE.

SPECIFICATION forming part of Letters Patent No. 374,273, dated December6, 1887. I

Application filed September 2S, 1887. Serial No. 250,920.

To all` whom t may concern:

Be it known that I, GEORGE M. SARGENT, a citizen of the United States,and a resident of Chicago, Cook county, Illinois, have invented certainnew and useful Improvements in BrakeShoes, of which the following is aspecification.

My invention relates to that class of brakeshoes which, by reason ofcertain portions thereof being harder than other parts, serves to dressdown or wear away the Wheel at certain points, so as to preserve theproper shape of the tread or wearing parts and prevent it from groovingunder` the combined wear of the rails and shoe; and it consists of ashoe having certain parts of its wearingface hardcned by means of chillsin the process of casting, as will be hereinafter fully set forth,-whercby to dress thewearing-face of the wheel as it is worn away.

It is Well known that the peripheries ofcarwheels become Worn Inostrapidly at certain points of the tread near the flange, so that thereare formed therein annular depressions or grooves, while the flangesbecome both thickened and lengthened, thus seriously impairing theefficiency of the wheels and rendering it often necessary to discardthem much sooner than would be required were the proper outline of theperiphery preserved. To preserve this desirable outline, and thusobviate the defects referred to,various expedients have been resortedto, such as inserting cutting blocks or plates of hard material into thesofter' metal of the brake-shoe and arranging them in various manners,so as to insure the desired wearing or cutting action. One suchconstruction forms the subject-matter of an application, No. 230,028,filed by me on the -7th day of March, 1837'.`

My present invention differs from such invention, in that in place ofthe hard cutting blocks or strips there used I chill certain sectionsofthe wearingface of the shoe outside the line of the rail-tread,andalso in the dangegroove.

In order that my invention may be better understood,l have illustratedit in the accompanying sheet of drawings, wherein- Figurel is asectional view illustrating the construction of the shoe, and also theeffect of wear upon a car-wheel. Fig. 2is a face View of the shoe. Figs.3 and 4 show different forms of the invention.

(No model.)

As the effect of the rails is to wear the tread 5 5 hollow, as indicatedby dotted lines, Fig. 1, and/at the same time to lengthen the flange sothat it becomes liable to cut the bolts of switches and spring-frogs, Iharden certain sections, a a, of the brake-shoe face A and of thegrooved flange A,shaped to fit the wheelflange by chills B, placed inmolds.

As the effect of the rails is to wear the Wheeltread most rapidly at thepoint x, the greatest cutting action, in order to properly dress thetread, is required along the outer edge thereof, and this may be securedby such construction as that shown in Figs. 3 and 4, wherein a greaterportion of the wearface of the brakeshoe adjacent to the outer edge ofthe Wheel is hardened than is nearer to the center of the tread,whereless friction or cutting is to be done. This effect may be secured invarious ways, two being illustrated. That in Fig. 3 consists in makingthe number of 75 hardened sections adjacent to the outer edge of thewheel greater than those adjacent to the tread portion,while in Fig. 5the same end is secured by tapering the sections toward thetread-engaging part of the shoe. In this way the shoe bears upon andconsequently wears down that part of the wheel not worn by the rail, andas a consequence the face of the wheel is kept true and smooth. y

I am aware that cast brakesshoes have been provided with chilledportions extending entirely across the face thereof, and I thereforedisclaim the broad idea of forming dressingsurfaces on abralte-shoe byIneansofhardened chilled sections.

I claim- 1. A brake-shoe provided with dressing or cutting sectionsalong the edge outside the tread, consisting of chilled portions of theshoe, substantially as described.

2. A brake-shoe having a grooved flange, A', shaped to the wheel-ange,in which are hardened chilled sections to dress down the Wheel-iiangeand preventits lengthening, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

GEORGE M. SARGENT.

IOO

Witnesses:

J. C. DAVIS, J. B. SWAN.

